Search found 4983 matches

by Jirka
Mon Jun 15, 2020 8:29 pm
Forum: HYDRUS (2D/3D)
Topic: Rapid increases in fluxes & high error
Replies: 3
Views: 279

Re: Rapid increases in fluxes & high error

I would need to see the project to be able to comment. J.
by Jirka
Mon Jun 15, 2020 5:16 pm
Forum: HYDRUS (2D/3D)
Topic: max number of time-variable thermal boundaries?
Replies: 1
Views: 189

Re: max number of time-variable thermal boundaries?

Indeed, Hydrus limits the max number of time-variable values for different processes. While for water flow, one can have Atmopheric BC, four time-variable heads, and four time-variable fluxes, for solute transport one can have three sets of time-variable concentrations/fluxes, and for heat transport...
by Jirka
Sun Jun 14, 2020 6:39 pm
Forum: Hydrus 1D
Topic: Non-closure outside of GUI
Replies: 8
Views: 582

Re: Non-closure outside of GUI

There is only one computational module (h1d_calc.exe), which can be either run from within GUI or externally. The only difference is how the program gets the information about the path to the folder where the input and output files are. I simply do not see any reason why the results should be differ...
by Jirka
Sun Jun 14, 2020 6:34 pm
Forum: HYDRUS (2D/3D)
Topic: water balance
Replies: 3
Views: 368

Re: water balance

The program integrates all fluxes across all boundaries and then uses them in the mass balance calculations. If Hydrus reports an error less than 1% (which it does in your case) then everything should be OK. Note that you cannot simply sum up fluxes from different files. The values there are the rat...
by Jirka
Thu Jun 11, 2020 11:31 pm
Forum: HYDRUS (2D/3D)
Topic: Strange issue with time-variable boundary conditions
Replies: 8
Views: 480

Re: Strange issue with time-variable boundary conditions

In the project that you sent me there is Variable head 1 BC on the bottom and Variable Head 4 BC on the top. Both BCs are applied correctly. It seems to me that you are wasting my time. J.
by Jirka
Thu Jun 11, 2020 8:43 pm
Forum: HYDRUS (2D/3D)
Topic: Strange issue with time-variable boundary conditions
Replies: 8
Views: 480

Re: Strange issue with time-variable boundary conditions

If I could see the project, I would undoubtedly find the reason of your troubles. J.
by Jirka
Thu Jun 11, 2020 6:25 pm
Forum: Hydrus 1D
Topic: Non-closure outside of GUI
Replies: 8
Views: 582

Re: Non-closure outside of GUI

If you follow our instructions from FAQ 4 (https://www.pc-progress.com/en/Default.aspx?h3d-faq-01-10#k4), you simply cannot get different results when running the computational modules from inside or outside of GUI. Your first error indicated that you have a problem with formatting of Atmosph.in. fo...
by Jirka
Thu Jun 11, 2020 3:18 pm
Forum: Hydrus 1D
Topic: Non-closure outside of GUI
Replies: 8
Views: 582

Re: Non-closure outside of GUI

Jeff,

If the attached files are the input files that you are using, then they clearly have the wrong extension. Why would you add ".txt" at the end of the names of these files?

J.
by Jirka
Thu Jun 11, 2020 1:37 am
Forum: HYDRUS (2D/3D)
Topic: Strange issue with time-variable boundary conditions
Replies: 8
Views: 480

Re: Strange issue with time-variable boundary conditions

The project that I posted was done in version 3. Here is the same project in version 2.

Next time you need to say what version you use. How am I supposed to know that?

J.
by Jirka
Wed Jun 10, 2020 11:21 pm
Forum: HYDRUS (2D/3D)
Topic: Strange issue with time-variable boundary conditions
Replies: 8
Views: 480

Re: Strange issue with time-variable boundary conditions

We are not aware of any such problem. I have made a very quick example (based on Test1) and I can see that both Variable Head BCs 1 and 2 (as well as 3 and 4) can be assigned. See the attached example and the figure below. J.
BC.png
BC.png (46.9 KiB) Viewed 477 times
by Jirka
Wed Jun 10, 2020 5:45 pm
Forum: Hydrus 1D
Topic: Soil water evaporation
Replies: 5
Views: 413

Re: Soil water evaporation

The surface node should be slightly unsaturated, i.e., the pressure head should be negative.

J.
by Jirka
Sun Jun 07, 2020 4:35 pm
Forum: Hydrus 1D
Topic: numerical solution
Replies: 3
Views: 352

Re: numerical solution

At atmospheric pressure and T=25C, the diffusion coefficient if Free air varies between about 0.15 and 0.25 cm2/s for gases of low molecular weight and decreases with increasing size of the diffusing molecule. Jury et al. (1983) recommended using an average value of about 0.06 cm2/s for pesticides o...
by Jirka
Sun Jun 07, 2020 4:30 pm
Forum: Hydrus 1D
Topic: MC sensitivity analysis outside of Hydrus
Replies: 2
Views: 3251

Re: MC sensitivity analysis outside of Hydrus

Instruction on how to run HYDRUS computational modules outside of GUI from MatLab can be found under FAQ29: https://www.pc-progress.com/en/Default.aspx?h3d-faq-21-30#k9 Instruction on how to run HYDRUS computational modules outside of GUI can be found under FAQ4: https://www.pc-progress.com/en/Defau...
by Jirka
Fri Jun 05, 2020 11:35 pm
Forum: HYDRUS (2D/3D)
Topic: Temperature BOundary COnditions
Replies: 1
Views: 240

Re: Temperature BOundary COnditions

No, it is currently not possible. Currently, internal nodes can only be assigned "Time-variable head/flux" BC for water flow and Cauchy BC for solute and heat transport. It would thus be relatively simple for me to modify the code to allow a Dirichlet BC (for heat transport) rather than a Cauchy BC ...
by Jirka
Fri Jun 05, 2020 3:48 pm
Forum: Hydrus 1D
Topic: Field data optimization
Replies: 4
Views: 1453

Re: Field data optimization

The file that you posted is corrupted and cannot be open. Anyway, I would likely not find time to look at it. I'm too busy recently to run Hydrus projects for Hydrus users (who are in thousands). I would not be doing anything else. J.